QMetaObject questions

[GrahamL]

Hi
Say I have a method that takes a point to a base class and I provide this method with a pointer to a class derived from the base.
Now, I want to use QMetaObject to get the class name

void myMethod(Base* ptr)
{
    QString s = ptr->metaObject()->className();
}

class name is always Base

Is there a wayuof getting the derived class name?

Thanks

[SGaist]

Hi,

Can you show the declaration of your Base and Derived classes ?

[JKSH]

Hi,

@GrahamL said:

class name is always Base

Add the Q_OBJECT macro to your derived class: http://doc.qt.io/qt-5/qobject.html#Q_OBJECT

Then, run qmake again and recompile your program.

[Devopia]

Hi,

void myMethod(Base* ptr)
{
auto derivedClass = ptr->metaObject()->superClass();
if (derivedClass)
QString s = derivedClass->className();
}

[JKSH]

@Devopia said:

void myMethod(Base* ptr)
{
auto derivedClass = ptr->metaObject()->superClass();
if (derivedClass)
QString s = derivedClass->className();
}

superClass() points to the base class, not the derived class...

[GrahamL]

Hi guys

Thanks for your replies
It turns out the the derived class did not have the Q_OBJECT macro

All working now

Thanks